bbb bbe bbk bbl bbt be- beb bee bek bel bet bkb bke bkk bkl bkt blb ble blk bll blt btb bte btk btl btt ebb ebe ebk ebl ebt eeb eee eek eel eet ekb eke ekl ekt elb ele elk ell elt etb ete etk etl ett k-t kbb kbe kbk kbl ke- keb kee kek kel ket kkb kke kkk kkl kkt kl- klb klt ktb kte ktk ktl ktt lbb lbe lbk lbl lbt leb lee lek lel let lkb lkl lkt llb lle llk lll llt ltb lte ltk ltl ltt tbb tbe tbk tbl tbt te- teb tee tek tel tet tkb tke tkk tkl tkt tle tlk tll tlt ttb tte ttk ttl ttt